PORTIBM PC Portable (uses same BIOS as XT) 0100 - 3COM 3C509 Ethernet card - ID port
Note: this port is present only on the 3C509, not on any other 3COM card
SeeAlso: PORTIBM PC Portable (uses same BIOS as XT) 0110h,PORTIBM PC Portable (uses same BIOS as XT) 0120h